Hacking Excel — Part I

Many of us use Excel more or less frequently. We all know the famous green file icon and the typical file extension *.xlsx.

However, only a few of us have spent some thoughts about this file format, right? And since Excel is just a tool for most of us, it’s perfectly fine not to think too much about the details of Excel files. Why should we? After all, we can also be good car drivers without knowing any details about the…